Chiral extrapolations and strangeness in the baryon ground states
arXiv:1301.0298
Abstract
We review the quark-mass dependence of the baryon octet and decuplet masses as obtained from recent lattice simulations of the BMW, PACS-CS, LHPC, HSC and QCDSF-UKQCD groups. Our discussion relies on the relativistic chiral Lagrangian and large- sum rule estimates of the counter terms relevant for the baryon masses at NLO. A partial summation is implied by the use of physical baryon and meson masses in the one-loop contributions to the baryon self energies. In our analysis the physical masses are reproduced exactly by means of a suitable set of linear constraints. A quantitative and simultaneous description of all lattice results is achieved in terms of a six parameter fit, where the symmetry conserving counter term that are relevant at NLO are not yet being used. For pion masses larger than 300 MeV there appears to be an approximate linear pion-mass dependence of all octet and decuplet baryon masses. We discuss the pion- and strangeness sigma terms of the baryon octet states.
arXiv commentTalk at the 7th International Workshop on Chiral Dynamics, August 6 -10, 2012, Jefferson Lab. 2nd version: corrected BWM values for the strangeness sigmaterms, added more QCDSF-UKQCD points to the plot
References in corpus (16)
- Ab-initio Determination of Light Hadron Masses
- First results from 2+1 dynamical quark flavors on an anisotropic lattice: light-hadron spectroscopy and setting the strange-quark mass
- Octet baryon masses and sigma terms from an SU(3) chiral extrapolation
- Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
- Flavour blindness and patterns of flavour symmetry breaking in lattice simulations of up, down and strange quarks
- Sigma term and strangeness content of octet baryons
- The low-lying baryon spectrum with two dynamical twisted mass fermions
- Hyperon sigma terms for 2+1 quark flavours
- Saturation from nuclear pion dynamics
- On the chiral effective meson-baryon Lagrangian at third order
- Baryon self energies in the chiral loop expansion
- Strangeness in the baryon ground states
- On the quark-mass dependence of the baryon ground-state masses
- Finite-volume effects on octet-baryon masses in covariant baryon chiral perturbation theory
- On the possibility of a discontinuous quark-mass dependence of baryon octet and decuplet masses
- On the consistency of recent QCD lattice data of the baryon ground-state masses